Screw.



No. 870,059. PATBNTED NOV.5, 1907.

J. STERNAMAN, JB. SCREW.

APPLICATION FILED JAN. 15, 1906.

UNITED STATES PATENT OFFICE.

SCREW.

Specification of Letters Patent.

Patented Nov. 5, 1907.

Application filed January l5, 1906. Serial No. 296,212-

To all 'whom it may concern:

Be it known that I, J OHN STERNAMAN, Jr., a citizen of the UnitedStates, residing at Springfield, in the county of Sangamon and State ofIllinois, have invented certain new and useful Improvements in Screws,of which the following is such a full, clear, and exact description aswill enable others skilled-in the art to which it appertains to make anduse my said invention.

My invention relates to tubular metal screws usable for any purpose forwhich such screws are suitable.

The purposes of my invention are to provide a screw which shall be lightand strong and flexible to a degree depending upon the metal of which itis made.

In the drawings I have shown and will hereinafter describe a screwadapted for use with a screw clamp such as is commonly used by joinersand pattern makers.

Another purpose of my invention is to provide a screw with a suitablehandle which may be integral therewith or may be connected with the bodyof the screw as hereinafter explained and to provide a screw threadedbushing usable with the screw.

With these ends in view my invention consists in the novel features ofconstruction and combinations of parts shown in the annexed drawings towhich reference is hereby made and hereinafter particularly describedand finally recited in the claim.

Referring to the drawings in which similar reference letters designatelike parts in the several views; Figure I is a top plan of a screw-clampembodying my invention; Fig. 2 is an enlarged partial vertical sectionon the line 2.2 of Fig. l.. In Fig. 2, the jaws of the clamp -and thebushing are shown in section and the screw proper is shown in elevation;Fig. 3 is a perspective view of a thimble adapted to Iit in one of thejaws and receive the thrust of one of the screws against the jaw, whenthe screws are used on a screw clamp or the like. Fig. 4 is an enlargedview of a screw having a wood handle and integral with the handle a woodreinforcement extending through the tubular metal screw; Fig. 5 is alongitudinal section of a part of a screw provided with a handleconnected with the body of the screw, the handle being of wood, metal orother suitable material; Fig. 6 is a plan of part of a screw in whichthe handle is integral with the body of the screw; Fig. 7 is atransverse section on the line 7.7 of Fig. 6; Fig. S is a sectional viewof a screw having a hollow handle secured on the body of the screw.

The jaws A of the screw-clamp are preferably of wood of the usual wellknown form. The body B of the screw is preferably made of steel tube ofsuitable thickness for the purpose for which the screw is intended.Screw threads b are formed in the metal of the tube alike inside andoutside of the tube. A part-b1 of the tube is without threads and fitsloosely in a hole in one of the jaws A. Tubular bushings D are formedfrom metal tubes threaded alike inside and outside and are cut off toform bushings of suitable length. The external screws b of the tube B tsthe female screw of the bushing D. The bushings D are screwed into andare held firmly in transverse holes a extending through the jaws A. Thehandle B1 is preferably ofwood and has an integral stem b2 provided withscrew threads b3 which match the threads on the inside of the tube B andwhen the parts are assembled the stem b2 completely fills the tube andreinforces it so as to greatly increase the strength of the screwwithout unduly increasing its weight. v

Occasion may arise in which it is desirable to have a metal handleeither integral with or connected with the body of the screw, instead ofa wooden handle detachably connected with the screw such as I havedescribed. The handle integral with the tubular body of the screw ispreferably formed by cutting longitudi-' nal slits bj* through the wallof the tube and then pressing the end of the tube to expand the severalmembers separated by the slits so as to form an oval handle havinglongitudinal slits and also having a shoulder b5 at the juncture of thehandle 'with the body of the tube as clearly shown in Figs. 6 and 7. Iffor any reason it is desired to use a metal handle connectedwith thebody of the tube a flange b6 may be'formed on one end of the tube andthe hollow metal handle B1 `may be formed to fit around the flange b6and the end of the handle may be given the form of a shoulder b5. Whenthe handle is in place on the tube it may be brazed or otherwisesuitably secured on the tube. In Fig. 5 the body of the tube B is shownas extending through the handle B1 and a rivet b`J orother suitablesecuring device secures the handle on the tube. A ferrule b1 at one endof the handle forms a shoulder to receive the end of the screw. Thethimble B2 fits in a hole extending part way through the jaw A and theend of the screw iits loosely in the thimble.

Having fully described my invention what I claim as new and desire tosecure by Letters Patent is:

A tubular screw-body threaded alike outside and inside, in combinationwith a reinforcement having a handle pro vided with a shoulder.

In witness whereof I have hereunto subscribed my name at Springfieldillinois this 27th day of December 1905.

JOHN STERNAMAN. JR.

Witnesses JOHN A. Boron, MARGARET McDoNALD.

